| /* |
| * linux/arch/unicore32/include/asm/pgalloc.h |
| * |
| * Code specific to PKUnity SoC and UniCore ISA |
| * |
| * Copyright (C) 2001-2010 GUAN Xue-tao |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #ifndef __UNICORE_PGALLOC_H__ |
| #define __UNICORE_PGALLOC_H__ |
| |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/processor.h> |
| #include <asm/cacheflush.h> |
| #include <asm/tlbflush.h> |
| |
| #define check_pgt_cache() do { } while (0) |
| |
| #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT) |
| #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT) |
| |
| extern pgd_t *get_pgd_slow(struct mm_struct *mm); |
| extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd); |
| |
| #define pgd_alloc(mm) get_pgd_slow(mm) |
| #define pgd_free(mm, pgd) free_pgd_slow(mm, pgd) |
| |
| #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) |
| |
| /* |
| * Allocate one PTE table. |
| */ |
| static inline pte_t * |
| pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) |
| { |
| pte_t *pte; |
| |
| pte = (pte_t *)__get_free_page(PGALLOC_GFP); |
| if (pte) |
| clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t)); |
| |
| return pte; |
| } |
| |
| static inline pgtable_t |
| pte_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| struct page *pte; |
| |
| pte = alloc_pages(PGALLOC_GFP, 0); |
| if (!pte) |
| return NULL; |
| if (!PageHighMem(pte)) { |
| void *page = page_address(pte); |
| clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t)); |
| } |
| if (!pgtable_page_ctor(pte)) { |
| __free_page(pte); |
| } |
| |
| return pte; |
| } |
| |
| /* |
| * Free one PTE table. |
| */ |
| static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| { |
| if (pte) |
| free_page((unsigned long)pte); |
| } |
| |
| static inline void pte_free(struct mm_struct *mm, pgtable_t pte) |
| { |
| pgtable_page_dtor(pte); |
| __free_page(pte); |
| } |
| |
| static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval) |
| { |
| set_pmd(pmdp, __pmd(pmdval)); |
| flush_pmd_entry(pmdp); |
| } |
| |
| /* |
| * Populate the pmdp entry with a pointer to the pte. This pmd is part |
| * of the mm address space. |
| */ |
| static inline void |
| pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) |
| { |
| unsigned long pte_ptr = (unsigned long)ptep; |
| |
| /* |
| * The pmd must be loaded with the physical |
| * address of the PTE table |
| */ |
| __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); |
| } |
| |
| static inline void |
| pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) |
| { |
| __pmd_populate(pmdp, |
| page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE); |
| } |
| #define pmd_pgtable(pmd) pmd_page(pmd) |
| |
| #endif |
